Which type of protocol is OSPF and what metric does it use to determine best path?

Which type of protocol is OSPF and what metric does it use to determine best path?
A . Link-state protocol that uses a concept of cost as metric
B . Hybrid protocol that uses hop count as a metric
C . Path vector protocol that uses the Dijkstra algorithm as a metric
D . Distance Vector protocol that uses bandwidth and delay as metric

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Answer: A